battery

Abstract

The application provides a battery, comprising: a pole; a transition sheet, comprising a pole connecting part and a tab connecting part electrically connected to opposite sides of the pole connecting part in a first direction, the first direction being perpendicular to the thickness direction of the transition sheet; the pole connecting part comprises a first surface and a second surface arranged oppositely in the thickness direction of the transition sheet, and the tab connecting part comprises a third surface arranged on the same side as the first surface; in the thickness direction of the transition sheet, the third surface has a height difference with the first surface, and the tab connecting part protrudes from the second surface towards the pole; wherein the second surface is provided with a groove, and the pole is in contact with the groove bottom; the first surface is provided with a welding area, and the surface roughness of the welding area is greater than the surface roughness of other areas of the transition sheet except the welding area. The battery provided by the application has better safety.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and more particularly to a battery. Background Technology

[0002] In the development of battery technology, besides improving the performance of individual battery cells, safety is also a crucial issue that cannot be ignored. If the safety of individual battery cells cannot be guaranteed, then those cells cannot be used. Therefore, how to enhance the safety of individual battery cells is a pressing technical problem that needs to be solved in battery technology. Utility Model Content

[0003] In view of this, the purpose of this application is to propose a battery that at least partially solves the problem of how to enhance the safety of individual battery cells.

[0004] Based on the above objectives, a first aspect of this application provides a battery, comprising: a terminal post; an adapter plate including a terminal post connecting portion and tab connecting portions electrically connected to opposite sides of the terminal post connecting portion along a first direction, the first direction being perpendicular to the thickness direction of the adapter plate; the terminal post connecting portion including a first surface and a second surface disposed opposite to each other along the thickness direction of the adapter plate, the tab connecting portion including a third surface disposed on the same side as the first surface; along the thickness direction of the adapter plate, the third surface and the first surface have a height difference, and the tab connecting portion protrudes from the second surface toward the terminal post; wherein, the second surface is provided with a groove, and the terminal post contacts the bottom of the groove; the first surface is provided with a welding area, the surface roughness of the welding area being greater than the surface roughness of other areas of the adapter plate excluding the welding area.

[0005] Optionally, along the thickness direction of the adapter piece, the orthographic projection of the groove on the first surface covers the welding area.

[0006] Optionally, it also includes a bare battery cell, which includes a plurality of bodies arranged along the first direction, and each of the tab connections is electrically connected to tabs of the same polarity of at least two of the bodies.

[0007] Optionally, a transition portion is formed between the first surface and the third surface, and the electrode tab is connected to the third surface; along the first direction, the minimum straight-line interval between the electrodes tabs respectively connected to the two third surfaces is L4, and the maximum straight-line interval between the two transition portions is L3, where L4 > L3.

[0008] Optionally, each of the electrode connecting portions is electrically connected to electrode portions of the same polarity of the two bodies, and the portion of the electrode portion near the body converges toward the contact surface of the two bodies along the first direction to form a converged portion.

[0009] Optionally, along the first direction, the minimum straight-line interval between the two converging portions is L5, and the maximum straight-line interval between the two transition portions is L3, where L5 > L3.

[0010] Optionally, the thickness of the adapter piece at the groove is T1, and the thickness at other parts excluding the groove is T2, with the ratio of T1 to T2 being 0.5 to 0.9.

[0011] Optionally, the groove wall is inclined toward the groove opening, and the inclination angle is θ, 90°<θ≤160°.

[0012] Optionally, the pole post includes a pole post bottom surface that contacts and connects with the bottom of the groove; along the thickness direction of the adapter piece, the orthographic projection of the pole post bottom surface onto the second surface is located within the groove; Along the first direction, the maximum dimension of the groove bottom is W1, the maximum dimension of the pole post bottom surface is W2, W1 is not less than W2, and the difference between the two is 0 mm to 6 mm; and / or, Along the second direction, the maximum dimension of the groove bottom is L1, the maximum dimension of the pole bottom surface is L2, L1 is not less than L2, and the difference between the two is 0mm to 6mm; the second direction, the first direction and the thickness direction of the adapter piece are perpendicular to each other.

[0013] Optionally, along the thickness direction of the adapter piece, the shape of the orthographic projection of the bottom surface of the pole post onto the second surface is the same as the shape of the bottom of the groove.

[0014] As can be seen from the above, in the battery provided by this application, the terminal connection portion of the adapter piece is used for welding to the terminal piece. A groove is provided on the second surface of the terminal connection portion facing the terminal piece, which reduces the thickness of the portion of the adapter piece corresponding to the terminal piece. This allows for better melt penetration during welding, effectively reducing welding difficulty. Even with lower welding power and shorter welding time, the welding quality between the terminal piece and the adapter piece can be guaranteed, improving the connection reliability and battery safety. When the welding power is reduced, the heat radiated from the welding position also decreases, reducing the risk of thermal deformation of the insulation and sealing structure near the terminal piece due to welding heat input. The groove on the second surface also serves to position the terminal piece, reducing the risk of misalignment between the adapter piece and the terminal piece during assembly, and simplifying the alignment of the adapter piece and the terminal piece.

[0015] Meanwhile, the thickness of the parts of the adapter plate other than the grooved part can be set relatively large to increase the current flow area of ​​the adapter plate, reduce the energy loss of current flow, and help improve the electrical performance of the battery.

[0016] Furthermore, by creating grooves only on the second surface facing the electrode post, the first surface of the electrode post connection can be made into a relatively flat surface. This ensures a good seal between the first surface and the welding nozzle, preventing welding oxidation and reducing the design complexity of the welding nozzle. Additionally, when applying adhesive to the solder mark on the first surface, its relatively flat surface provides a larger effective adhesion area, ensuring a better adhesive application effect.

[0017] By designing a larger surface roughness in the welding area on the first surface, the laser energy during welding can be absorbed through this rough surface, reducing the laser welding power, lowering production costs, preventing the formation of welding slag, improving welding effect, preventing internal short circuits in battery cells, and thus improving battery safety and quality. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a top view of a battery with the first structure according to an embodiment of this application. Figure 2 for Figure 1 Partial cross-sectional diagram of section AA; Figure 3 The battery of the second structure in the embodiments of this application is in Figure 1 Partial cross-sectional diagram of section AA; Figure 4 for Figure 3 Enlarged schematic diagram of part B; Figure 4a for Figure 4 An enlarged schematic diagram of section C; Figure 5 This is a schematic diagram of the adapter piece for a battery with a second structure according to an embodiment of this application; Figure 6 This is a schematic diagram showing the alignment of the adapter plate and the terminal post of a battery with a second structure according to an embodiment of this application. Figure 7 This is a schematic diagram of the second type of battery structure in this application, where the adapter piece is assembled to the terminal post before welding; Figure 8 This is a schematic diagram of the welding of the adapter plate and the terminal post of the battery with the second structure according to an embodiment of this application; Figure 9 This is a schematic diagram of the adapter piece with a third structure according to an embodiment of this application; Figure 10 This is a schematic diagram of the assembly of the adapter plate and the pole post according to the third structure of this application; Figure 11 This is a top view schematic diagram of the pole column according to an embodiment of this application; Figure 12 This is a top view of the adapter piece with the third structure according to an embodiment of this application.

[0020] Explanation of reference numerals in the attached figures: 1000, Cover plate assembly; 100, Cover plate; 200, Terminal post; 210, Terminal post base plate; 211, Terminal post bottom surface; 200a, Positive terminal post; 200b, Negative terminal post; 300, Explosion-proof valve; 400, Lower insulating component; 2000, Adapter piece; 2100, Terminal post connection; 2110, First surface; 2111, Welding area; 2120, Second surface; 2200, Terminal lug connection; 2210, Third surface; 2300, Groove; 2400, Transition section; 2000a, Positive adapter piece; 2000b, Negative adapter piece; 3000, bare cell; 3100, main body; 3100a, first main body; 3100b, second main body; 3100c, third main body; 3100d, fourth main body; 3200, tab; 3200a, positive tab; 3200b, negative tab; 3210, gathering part; 4000, housing; 4100, open end; 5000, storage space; 6000, welding nozzle. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0022] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components described in these embodiments do not limit the scope of this application.

[0023] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0024] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0025] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] Figure 1 A top view of the first type of battery structure is shown. Figure 2 Showing Figure 1 A partial cross-sectional diagram of section AA.

[0027] like Figure 1 and Figure 2 The battery may include a housing 4000 and a cover assembly 1000, the housing 4000 having an opening 4100 at its top. The cover assembly 1000 includes a cover 100, and terminals 200, a lower insulator 400, and an explosion-proof valve 300 connected to the cover 100. The cover 100 is closed to the opening 4100 so that the cover assembly 1000 and the housing 4000 can be closed to form a receiving space 5000 for accommodating bare cells 3000. The lower insulator 400 is connected to the side of the cover 100 near the bare cells 3000. The terminals 200 are at least partially inserted through the cover 100, and the bottom end of the terminals 200 may be provided with a terminal base plate 210. The terminal base plate 210 includes a terminal bottom surface 211 away from the cover 100, the terminal bottom surface 211 being exposed relative to the lower insulator 400.

[0028] Within the accommodating space 5000, an adapter plate 2000 is provided between the bare cell 3000 and the cover plate assembly 1000. The tab 3200 of the bare cell 3000 is welded to the bottom surface 211 of the terminal post through the adapter plate 2000, thereby realizing the electrical connection between the bare cell 3000 and the terminal post 200.

[0029] For example, the cover plate 100 and the housing 4000 can be made of aluminum, steel, etc. The cover plate 100 and the housing 4000 can be connected by means of adhesive, riveting, welding, etc. For example, the cover plate 100 and the housing 4000 can be made of aluminum and can be welded together.

[0030] For example, the lower insulating member 400 and the cover plate 100 can be connected by means of adhesive bonding or heat pressing.

[0031] With the rapid development of batteries, the requirements for battery round-trip efficiency (RTE) are becoming increasingly stringent. To meet these requirements, the internal resistance of the adapter 2000 can be reduced, thereby reducing energy loss caused by current flowing through the heat generated by the adapter 2000.

[0032] To reduce the internal resistance of the adapter piece 2000, one approach is to increase its overall thickness. However, since the adapter piece 2000 and the terminal post 200 are welded on the surface of the adapter piece 2000 away from the terminal post 200, increasing the overall thickness of the adapter piece 2000 may lead to poorer melt penetration, resulting in reduced welding quality and poor connection reliability. Furthermore, excessively high welding temperatures may cause heat damage to the lower insulating component 400 and the sealing structure fitted onto the terminal post 200, thereby affecting the battery's sealing performance and safety.

[0033] To address the aforementioned issues, this embodiment provides batteries with alternative structures.

[0034] Figure 3 The second type of battery structure was demonstrated. Figure 1 Partial cross-sectional diagram of section AA. Figure 4 Showing Figure 3 An enlarged diagram of part B in the middle. Figure 5 A schematic diagram of the adapter piece 2000 for the second type of battery structure is shown.

[0035] like Figure 3 , Figure 4 and Figure 5 In some embodiments, the battery includes: a terminal post 200; an adapter piece 2000, including a terminal post connection portion 2100, and a connection portion along a first direction (e.g., Figure 3 The first direction (Y direction) is electrically connected to the tab connection portions 2200 on both sides of the electrode connection portion 2100, and the first direction is perpendicular to the thickness direction of the adapter piece 2000 (the thickness direction of the adapter piece 2000 is...). Figure 3(Z direction in the diagram); the pole connection portion 2100 includes a first surface 2110 and a second surface 2120 disposed opposite to each other along the thickness direction of the adapter piece 2000; the tab connection portion 2200 includes a third surface 2210 disposed on the same side as the first surface 2110; along the thickness direction of the adapter piece 2000, there is a height difference between the third surface 2210 and the first surface 2110, and the tab connection portion 2200 protrudes from the second surface 2120 toward the pole piece 200; wherein, the second surface 2120 is provided with a groove 2300, and the pole piece 200 contacts the bottom of the groove 2300; the first surface 2110 is provided with a welding area 2111, and the surface roughness of the welding area 2111 is greater than the surface roughness of other areas of the adapter piece 2000 except for the welding area 2111.

[0036] For example, the electrode post connection 2100 and the electrode tab connection 2200 can be electrically connected by means of integral molding, welding, conductive adhesive bonding or plugging.

[0037] It should be noted that the roughness of the weld area 2111 can be increased in various ways. For example, a rough surface can be formed on the surface of the weld area 2111 by grinding, sandblasting, or solvent etching.

[0038] It should be noted that the groove 2300 can be formed by metal cutting or upsetting the second surface 2120.

[0039] In this embodiment, the thickness of the two tab connecting portions 2200 of the adapter piece 2000 and the thickness of the portion of the pole connecting portion 2100 excluding the groove 2300 are approximately the same, while the thickness of the portion of the pole connecting portion 2100 where the groove 2300 is provided is relatively small.

[0040] by Figure 4 Taking the direction and structure shown as an example, the bottom surface of the pole post connector 2100 is the first surface 2110, the top surface of the pole post connector 2100 is the second surface 2120, and the bottom surface of the tab connector 2200 is the third surface 2210. There is a height difference between the third surface 2210 and the first surface 2110, and the tab connector 2200 protrudes from the second surface 2120 toward the pole post 200. That is, the tab connector 2200 is located at a higher position, while the pole post connector 2100 is located at a lower position. The pole post connector 2100 and the tab connectors 2200 on both sides of it are constructed into an inverted Z-shaped structure.

[0041] Still Figure 4Taking the structure and orientation shown as an example, when the pole post 200 is welded to the adapter piece 2000, heat will radiate outward. To prevent the lower insulating part 400 from deforming due to heat, the pole post 200 can be designed to protrude a certain height from the bottom surface of the lower insulating part 400. This allows the pole post connecting part 2100 to be aligned with the lower insulating part 400 along the... Figure 4 Maintaining a large gap in the Z direction reduces the heat transferred to the lower insulator 400.

[0042] However, the inventors discovered that when the electrode post 200 and the adapter piece 2000 are welded, the heat radiated outward from the electrode tab connection 2200 is relatively small. Even if the distance between the electrode tab connection 2200 and the lower insulating member 400 is small, it will not have an adverse effect on the lower insulating member 400. If the electrode tab connection 2200 and the electrode post connection 2100 are flush (i.e., the first surface 2110 and the third surface 2210 are flush), then there will be a large gap between the top surface of the electrode tab connection 2200 and the bottom surface of the lower insulating member 400, resulting in wasted space.

[0043] To solve the above problems, in this embodiment, the tab connection portion 2200 is designed to protrude from the second surface 2120, so that the distance between the top surface of the tab connection portion 2200 and the bottom surface of the lower insulating member 400 is smaller than the distance between the second surface 2120 and the bottom surface of the lower insulating member 400, so as to reserve more space for the tab 3200 of the bare cell 3000 below the tab connection portion 2200.

[0044] Figure 6 A schematic diagram showing the alignment of the adapter piece 2000 and the pole post 200 in the second structure is displayed. Figure 7 The diagram shows the second type of battery assembly, where the adapter piece 2000 is assembled onto the terminal post 200 before welding. Figure 8 A schematic diagram showing the welding of adapter plate 2000 and pole post 200 is provided.

[0045] The terminal 200 may include a positive terminal 200a and a negative terminal 200b. Correspondingly, the adapter 2000 includes a positive adapter 2000a and a negative adapter 2000b. The positive adapter 2000a is welded to the positive terminal 200a to achieve an electrical connection, and the negative adapter 2000b is welded to the negative terminal 200b to achieve an electrical connection.

[0046] like Figure 6 and Figure 7 When welding the electrode post 200 and the adapter piece 2000, the electrode post 200 is inverted (i.e., the bottom surface 211 of the electrode post faces upward), and the second surface 2120 of the electrode post connecting part 2100 faces downward toward the electrode post 200. The groove 2300 on the second surface 2120 is aligned with the electrode post 200, and the electrode post 200 is inserted into the groove 2300 until the electrode post 200 contacts the bottom of the groove 2300. Figure 8 Then, the welding nozzle 6000 approaches the welding area 2111 on the first surface 2110 and performs laser welding.

[0047] As can be seen from the foregoing, the portion of the pole post connector 2100 with the groove 2300 has a smaller thickness, that is, the portion of the adapter piece 2000 corresponding to the pole post 200 has a smaller thickness, resulting in better melting penetration. This can effectively reduce the welding difficulty, and a reliable connection can be formed between the pole post 200 and the adapter piece 2000 with lower laser energy and shorter welding time.

[0048] Meanwhile, due to the large surface roughness of the welding area 2111, the laser energy during welding can be absorbed through this rough surface, reducing the laser welding power and lowering production costs.

[0049] In the battery provided in this application embodiment, the terminal connection portion 2100 of the adapter piece 2000 is used for welding to the terminal piece 200. A groove 2300 is provided on the second surface 2120 of the terminal connection portion 2100 facing the terminal piece 200, which can reduce the thickness of the portion of the adapter piece 2000 corresponding to the terminal piece 200. During welding, this allows for better melt penetration, thereby effectively reducing the welding difficulty. Even with lower welding power and shorter welding time, the welding quality between the terminal piece 200 and the adapter piece 2000 can be guaranteed, improving the connection reliability between the terminal piece 200 and the adapter piece 2000. When the welding power is reduced, the heat radiated to the outside at the welding position is also reduced, which can reduce the risk of thermal deformation of the insulation and sealing structure near the terminal piece 200 due to welding heat input. The groove 2300 provided on the second surface 2120 can also position the pole post 200. During assembly, it can reduce the risk of mismatch between the adapter piece 2000 and the pole post 200, and reduce the difficulty of aligning the adapter piece 2000 and the pole post 200.

[0050] Meanwhile, the thickness of the portion of the adapter plate 2000 other than the portion with the groove 2300 can be set relatively large to increase the current flow area of ​​the adapter plate 2000, reduce the energy loss of current flow, and help improve the electrical performance of the battery.

[0051] Furthermore, by providing the groove 2300 only on the second surface 2120 facing the pole post 200, the first surface 2110 of the pole post connection 2100 can form a relatively flat surface. When the first surface 2110 contacts the welding nozzle 6000, it can ensure a sealing effect between the two, prevent welding oxidation, and reduce the design complexity of the welding nozzle 6000. In addition, when applying adhesive to the solder mark on the first surface 2110, because the first surface 2110 is relatively flat, it can provide a larger effective bonding area, ensuring a better solder mark adhesive application effect.

[0052] By designing a larger surface roughness for the welding area 2111 on the first surface 2110, the laser energy during welding can be absorbed through this rough surface, reducing the laser welding power, lowering production costs, preventing the formation of welding slag, improving the welding effect, preventing internal short circuits in battery cells, and thus improving the safety and quality of the battery.

[0053] like Figure 5 and Figure 6 In some embodiments, along the thickness direction of the adapter piece 2000, the groove 2300 covers the welding area 2111 in the orthographic projection of the first surface 2110.

[0054] For example, the surface of the pole post 200 that contacts the bottom of the groove is simply referred to as the pole post bottom surface 211, and the shape of the bottom of the groove 2300 may be the same as or different from the shape of the pole post bottom surface 211.

[0055] For example, the shape of the welding area 2111 may be the same as or different from the shape of the bottom of the groove 2300.

[0056] For example, the bottom of the groove 2300 can be rectangular, circular, or oblong (or racetrack-shaped), etc.

[0057] As described above, the portion of the adapter piece 2000 with the groove 2300 is relatively thin, which is crucial for improving the welding quality between the pole post 200 and the adapter piece 2000. Without compromising the structural strength of the pole post connection 2100, the groove 2300 can be provided in as large an area as possible on the second surface 2120. This ensures that during welding, the welded portion consists only of the thinner part of the adapter piece 2000, effectively reducing the risk of poor welding such as incomplete welds between the pole post 200 and the adapter piece 2000, and further improving the welding quality between the pole post 200 and the adapter piece 2000.

[0058] like Figure 3 and Figure 4 In some embodiments, the battery further includes a bare cell 3000, which includes a plurality of bodies 3100 arranged along a first direction, and each tab connection portion 2200 is electrically connected to a tab 3200 of the same polarity of at least two bodies 3100.

[0059] like Figure 4 The bare cell 3000 may include an even number of bodies 3100, for example, it may include four bodies 3100.

[0060] It should be noted that the same main body 3100 leads out a positive tab 3200a and a negative tab 3200b. The multiple main bodies 3100 in the bare cell 3000 can be divided into two groups and electrically connected to the corresponding adapter pieces 2000 respectively.

[0061] like Figure 4 and Figure 7 The bare battery cell 3000 may include a first body 3100a, a second body 3100b, a third body 3100c, and a fourth body 3100d. The first body 3100a and the second body 3100b may be grouped together, and the third body 3100c and the fourth body 3100d may be grouped together.

[0062] The positive electrode tab 3200a, which is drawn from the first body 3100a and the second body 3100b, is electrically connected to one of the electrode tab connection parts 2200 of the positive adapter 2000a after being brought together, and the negative electrode tab 3200b, which is drawn from the first body 3100a and the second body 3100b, is electrically connected to one of the electrode tab connection parts 2200 of the negative adapter 2000b after being brought together.

[0063] The positive electrode tab 3200a, which is drawn from the third body 3100c and the fourth body 3100d, is electrically connected to the other electrode tab connection part 2200 of the positive adapter 2000a after being brought together, and the negative electrode tab 3200b, which is drawn from the third body 3100c and the fourth body 3100d, is electrically connected to the other electrode tab connection part 2200 of the negative adapter 2000b after being brought together.

[0064] After the bare cell 3000 is electrically connected to the adapter piece 2000, the whole assembly of the bare cell 3000 and the adapter piece 2000 is then electrically connected to the terminal 200.

[0065] In this embodiment, the same group includes at least two main bodies 3100, that is, each tab connection portion 2200 is electrically connected to the tabs 3200 of the same polarity of at least two main bodies 3100 (that is, both are positive tabs 3200a, or both are negative tabs 3200b).

[0066] Understandably, the more main bodies 3100 there are in a battery, the greater the battery capacity. Each tab connection 2200 is electrically connected to the tabs 3200 of multiple main bodies 3100, which can provide a structural basis for increasing the battery capacity.

[0067] like Figure 4 In some embodiments, a transition portion 2400 is formed between the first surface 2110 and the third surface 2210, and a tab 3200 is connected to the third surface 2210; along the first direction, the minimum straight-line interval between the tabs 3200 connected to the two third surfaces 2210 is L4, and the maximum straight-line interval between the two transition portions 2400 is L3, where L4 > L3.

[0068] For example, tab 3200 is welded to third surface 2210 to achieve electrical connection between the two.

[0069] For example, the surface of the transition portion 2400 can be an arc surface or a slope.

[0070] Combination Figure 4 As can be seen, the transition portion 2400 protrudes from the third surface 2210. When the tab 3200 is connected to the third surface 2210, if the tab 3200 abuts against the protruding transition portion 2400, the transition portion 2400 will exert a lifting force on the tab 3200 to drive the tab 3200 to separate from the third surface 2210, which may adversely affect the reliability of the connection between the tab 3200 and the tab connection portion 2200. At the same time, if the transition portion 2400 squeezes the tab 3200, it may also drive the tab 3200 to insert into the main body 3100, damaging the insulating diaphragm inside the main body 3100, which may cause an internal short circuit in the bare cell 3000.

[0071] To avoid the above problems, in this embodiment, L4 and L3 are designed such that L4 > L3. This allows the tab 3200 to be located on the side of the transition portion 2400 near the tab connection portion 2200 along the first direction, and the tab 3200 and the transition portion 2400 are spaced apart, so the tab 3200 and the transition portion 2400 will not come into contact. Therefore, the transition portion 2400 will not exert force on the tab 3200, which can ensure a high connection reliability between the tab 3200 and the adapter piece 2000. It can also reduce the risk of the tab 3200 being squeezed into the main body 3100 by the adapter piece 2000, which helps to improve the electrical performance and safety of the battery.

[0072] like Figure 4 In some embodiments, each tab connection portion 2200 is electrically connected to the same polarity tabs 3200 of the two bodies 3100, and the portion of the tab 3200 near the body 3100 converges toward the contact surface of the two bodies 3100 along a first direction to form a converged portion 3300.

[0073] It should be noted that, taking the positive electrode tab 3200a derived from the same main body 3100 as an example, the positive electrode tab 3200a includes multiple metal sheets. Before connecting the electrode tab 3200 to the electrode connecting part 2200, these metal sheets need to be gathered together. After these metal sheets are gathered together, the part near the root (i.e., the part connected to the main body 3100) remains relatively dispersed, while the part near the end is tightly fitted. The part where the dispersed part and the tightly fitted part are connected is the gathering part 3300 in this embodiment.

[0074] Similarly, when one tab connection 2200 connects two identical tabs 3200 led out from the main body 3100, the identical tabs 3200 led out from the two main bodies 3100 need to be gathered together to form a gathered portion 3300. When the gathered portion 3300 is roughly aligned with the contact surface of the two main bodies 3100 along the thickness direction of the adapter piece 2000, it helps to reduce the overall height of the tab 3200 after bending, so that the space occupied by the tab 3200 in the height direction inside the battery is smaller. This provides a structural basis for setting a larger main body 3100 inside the battery, which helps to improve the energy density of the battery.

[0075] like Figure 4 In some embodiments, along the first direction, the minimum straight-line interval between the two converging portions 3300 is L5, and the maximum straight-line interval between the two transition portions 2400 is L3, where L5 > L3.

[0076] Combination Figure 4 It can be seen that the converging portion 3300 is located above the main body 3100, while the terminal connection portion 2100 and the transition portion 2400 are located at a lower height. To avoid interference between the converging portion 3300 and the transition portion 2400 and the terminal connection portion 2100, in this embodiment, L5 and L3 are designed such that L5 > L3. In this way, the converging portion 3300 can be located on the side of the transition portion 2400 near the terminal connection portion 2200 along the first direction, and the converging portion 3300 and the transition portion 2400 are spaced apart. The converging portion 3300 will not contact the transition portion 2400 and the terminal connection portion 2100, which can effectively prevent interference between the converging portion 3300 and the transition portion 2400 and the terminal connection portion 2100, and helps to improve the electrical performance and safety of the battery.

[0077] like Figure 4 In some embodiments, the thickness of the adapter piece 2000 at the groove 2300 is T1, and the thickness at other parts excluding the groove 2300 is T2, with the ratio of T1 to T2 being 0.5 to 0.9.

[0078] For example, It can be 0.5, 0.6, 0.7, 0.8 or 0.9.

[0079] It should be noted that T1 and T2 have the same unit, which can both be mm.

[0080] like If the thickness is too small, the thickness of the groove 2300 in the adapter piece 2000 will be too small. During welding, this part may be welded through, which will adversely affect the welding quality between the terminal post 200 and the adapter piece 2000. It may also result in lower structural strength in this part and higher internal resistance in the adapter piece 2000, negatively impacting the battery's electrical performance. If the groove is too large, the thickness of the groove 2300 in the adapter piece 2000 will be too large, and the effect of improving the welding quality of the adapter piece 2000 and the pole post 200 by setting the groove 2300 will not be obvious.

[0081] To avoid the above problems, this embodiment will The design of 0.5 to 0.9 ensures that the part of the adapter piece 2000 with the groove 2300 has the structural strength to meet the process requirements, reduces the energy loss of current passing through the adapter piece 2000, prevents the part from being welded through during welding, ensures the welding quality of the adapter piece 2000 and the terminal post 200, improves the connection reliability between the two, and thus helps to improve the electrical performance and safety of the battery.

[0082] Figure 4a Showing Figure 4 An enlarged schematic diagram of section C.

[0083] like Figure 4a In some embodiments, the groove wall of the groove 2300 is inclined toward the groove opening, and the inclination angle is θ, 90°<θ≤160°.

[0084] It should be noted that the inclination angle of the groove wall of groove 2300 is the angle between the groove wall and the bottom of groove 2300.

[0085] For example, θ can be 91°, 95°, 100°, 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, 150°, 155° or 160°.

[0086] During the process of inserting the pole post 200 into the groove 2300, the groove wall of the inclined groove 2300 can guide the pole post 200. When the pole post 200 contacts the groove wall, the pole post 200 can slide into the groove 2300 along the groove wall, which can effectively reduce the difficulty of aligning the pole post 200 with the groove 2300.

[0087] If θ is too large, the groove wall will be too flat, and its guiding effect on the pole 200 will not be obvious.

[0088] To avoid the above problems, this embodiment designs the inclination angle θ of the groove wall to be 90°<θ≤160°, which makes the guiding effect of the groove wall of the inclined groove 2300 on the pole post 200 more obvious, effectively reducing the assembly difficulty of the pole post 200 and the adapter piece 2000, improving assembly efficiency, and facilitating mass production.

[0089] Figure 9 A schematic diagram of the third type of adapter plate 2000 is shown. Figure 10 An assembly diagram of the adapter plate 2000 and the pole post 200 of the third structure is shown.

[0090] like Figure 9 and Figure 10 In some embodiments, the pole post 200 includes a pole post bottom surface 211 that contacts and connects to the bottom of the groove 2300. Along the thickness direction of the adapter piece 2000, the orthographic projection of the pole post bottom surface 211 on the second surface 2120 is located within the groove 2300, and the shape of the orthographic projection of the pole post bottom surface 211 on the second surface 2120 is the same as the shape of the bottom of the groove 2300.

[0091] It should be noted that in the same battery, the positive adapter 2000a and the negative adapter 2000b can have the same or different structures.

[0092] Understandably, during the fabrication of the adapter piece 2000, the relative positions of the groove 2300 and the welding area 2111 are fixed. The bottom surface 211 of the pole post has the same shape as the bottom of the groove 2300. The groove 2300 can be used to achieve a more precise positioning effect on the pole post 200, so that the bottom surface 211 of the pole post can be more easily aligned with the welding area 2111, thereby further improving the welding quality of the pole post 200 and the adapter piece 2000.

[0093] At the same time, it can further reduce the risk of assembly errors between the pole post 200 and the adapter piece 2000.

[0094] Figure 11 A top-view schematic diagram of the pole column 200 is shown. Figure 12 A top view schematic diagram of the third type of adapter plate 2000 is shown.

[0095] like Figure 11 and Figure 12 In some embodiments, along the first direction, the maximum dimension of the bottom of the groove 2300 is W1, the maximum dimension of the bottom surface 211 of the pole post is W2, W1 is not less than W2, and the difference between the two is 0mm to 6mm.

[0096] For example, the difference between W1 and W2 can be 0mm, 1mm, 2mm, 3mm, 4mm, 5mm or 6mm.

[0097] If the difference between W1 and W2 is too large, that is, the size difference between the two is too large, then the movement space of the bottom surface 211 of the pole post in the groove 2300 along the first direction is too large. The effect of accurately positioning the pole post 200 through the groove 2300 is not obvious, and it is difficult to ensure that the bottom surface 211 of the pole post can achieve a relatively accurate alignment with the welding area 2111.

[0098] To avoid the above problems, this embodiment designs the difference between W1 and W2 to be 0mm to 6mm. The groove 2300 can achieve a more precise positioning effect on the pole post 200, so that the bottom surface 211 of the pole post can be more conveniently and accurately aligned with the welding area 2111, thereby further improving the welding quality of the pole post 200 and the adapter piece 2000.

[0099] like Figure 11 and Figure 12 In some embodiments, along the second direction (e.g.) Figure 11 and Figure 12 In the X direction), the maximum dimension of the groove bottom of the groove 2300 is L1, and the maximum dimension of the bottom surface of the pole post 211 is L2. L1 is not less than L2, and the difference between the two is 0mm to 6mm; the second direction, the first direction and the thickness direction of the adapter piece 2000 are perpendicular to each other.

[0100] For example, the difference between L1 and L2 can be 0mm, 1mm, 2mm, 3mm, 4mm, 5mm or 6mm.

[0101] The problems caused by an excessively large difference between L1 and L2 are similar to those caused by an excessively large difference between W1 and W2. Furthermore, the beneficial effects achieved by designing the difference between L1 and L2 to be between 0 mm and 6 mm are similar to those achieved by designing the difference between W1 and W2 to be between 0 mm and 6 mm, and will not be elaborated further here.

[0102] It should be noted that some embodiments of this application have been described above. Other embodiments are within the scope of the appended claims.

[0103] The various embodiments in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0104] The description in this application is given for illustrative purposes and is not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of this application and to enable those skilled in the art to understand this application and design various embodiments with various modifications suitable for a particular purpose.

[0105] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application is limited to these examples; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0106] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0107] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A battery, characterized by, include: pole; An adapter plate includes a pole connection portion and tab connection portions electrically connected to opposite sides of the pole connection portion along a first direction, the first direction being perpendicular to the thickness direction of the adapter plate; the pole connection portion includes a first surface and a second surface disposed opposite to each other along the thickness direction of the adapter plate, and the tab connection portion includes a third surface disposed on the same side as the first surface; along the thickness direction of the adapter plate, the third surface and the first surface have a height difference, and the tab connection portion protrudes from the second surface toward the pole; The second surface is provided with a groove, and the pole post contacts the bottom of the groove; the first surface is provided with a welding area, and the surface roughness of the welding area is greater than the surface roughness of other areas of the adapter piece except for the welding area.

2. The battery of claim 1, wherein, Along the thickness direction of the adapter piece, the orthographic projection of the groove on the first surface covers the welding area.

3. The battery of claim 1, wherein, It also includes bare cells, each of which comprises a plurality of bodies arranged along the first direction, and each of the tab connections is electrically connected to tabs of the same polarity of at least two of the bodies.

4. The battery of claim 3, wherein, A transition portion is formed between the first surface and the third surface, and the electrode tab is connected to the third surface; along the first direction, the minimum straight-line interval between the electrodes tabs connected to the two third surfaces is L4, and the maximum straight-line interval between the two transition portions is L3, where L4 > L3.

5. The battery according to claim 3, characterized in that, Each of the electrode connecting portions is electrically connected to the same polarity electrode of the two bodies, and the portion of the electrode near the body converges toward the contact surface of the two bodies along the first direction to form a converged portion.

6. The battery of claim 5, wherein, A transition portion is formed between the first surface and the third surface; along the first direction, the minimum straight-line interval between the two converging portions is L5, and the maximum straight-line interval between the two transition portions is L3, where L5 > L3.

7. The battery of claim 1, wherein, The thickness of the adapter piece at the groove is T1, and the thickness at other parts is T2, with the ratio of T1 to T2 being 0.5 to 0.

9.

8. The battery according to claim 1, characterized in that, The groove wall is inclined toward the groove opening, and the inclination angle is θ, 90°<θ≤160°.

9. The battery of claim 1, wherein, The pole post includes a pole post bottom surface that contacts and connects with the bottom of the groove; along the thickness direction of the adapter piece, the orthographic projection of the pole post bottom surface onto the second surface is located within the groove; Along the first direction, the maximum dimension of the groove bottom is W1, the maximum dimension of the pole post bottom surface is W2, W1 is not less than W2, and the difference between the two is 0 mm to 6 mm; and / or, Along the second direction, the maximum dimension of the groove bottom is L1, the maximum dimension of the pole bottom surface is L2, L1 is not less than L2, and the difference between the two is 0mm to 6mm; the second direction, the first direction and the thickness direction of the adapter piece are perpendicular to each other.

10. The battery according to claim 9, characterized in that, Along the thickness direction of the adapter piece, the shape of the orthographic projection of the bottom surface of the pole post onto the second surface is the same as the shape of the bottom of the groove.

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